The word "Dionsea" is a proper noun that can be spelled using the International Phonetic Alphabet (IPA) as /daɪ'ɒn.si:ə/. The first syllable "daɪ" represents the diphthong "ai" as in "eye", followed by the "ɒ" sound as in "not". The second syllable "n.si" represents the "n" sound followed by "si" pronounced as "see". The final syllable "ə" represents the schwa sound as in "a" in "sofa". In summary, Dionsea can be correctly spelled as /daɪ'ɒn.si:ə/.